Process for the preparation of bis (2-benzoxazolyl) stilbenes
AssigneeEastman Kodak Company
InventorRichard H. S. Wang
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Abstract
Disclosed is an improved process for the preparation of 4,4'-bis(2-benzoxazolyl)stilbene compounds by the reaction of 4,4'-stilbenedicarboxylic acid with 2-aminophenol compounds in the presence of a tin or titanium catalyst and certain solvents.
Claims3
Process for the preparation of 4,4'-bis(2-benzoxazolyl)stilbene compounds having the formula ##STR3## which comprises the step of reacting 4,4'-stilbenedicarboxylic acid with one or more 2-aminophenol compounds having the formula in the presence of a tin or titanium catalyst and an inert organic solvent having a boiling point above 200.degree. C. selected from alkyl-substituted naphthalenes having 11 to 20 carbon atoms, wherein each R.sup.1 is independently selected from hydrogen, alkyl of up to 12 carbon atoms and alkoxy of up to 12 carbon atoms.
Process for the preparation of 4,4'-bis(2-benzoxazolyl) stilbene compounds having the formula ##STR4## which comprises the step of reacting 4,4'-stilbenedicarboxylic acid with one or more 2-aminophenol compounds having the formula ##STR5## a temperature in the range of 220.degree. to 260.degree. C. in the presence of a titanium alkoxide catalyst and an inert organic solvent having a boiling point above 200.degree. C. selected form alkyl-substituted naphthalenes having 11 to 20 carbon atoms, wherein each R.sup.1 is independently selected from hydrogen and alkyl of up to 4 carbon atoms.
Dependencies are inferred from the claim text.